JPH09311796A - Automatic restoration device for device operation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily restore the operation of a device fallen into an abnormal state. SOLUTION: A micro computer 104 always monitors the setting values of the respective registers 106, 107 and 108 of N-pieces of IC 101, IC 102, IC 103 and judges whether the setting values are normal or not. When it detects IC fallen into an abnormal state owing to the shock of electrostatic noise or the like, the normal value is set again in the register of IC and the operation of IC, where a fault occurs, is restored.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device operation automatic restoration device for returning the operation of a device that has been abnormally operated due to electrostatic noise or external noise to the normal state inside a microcomputer-embedded device.

[0002]

2. Description of the Related Art As a conventional device initialization device, JP-A-55-123715 has been proposed, and an example of a technique for minimizing the damage to the equipment due to the hang-up of each device is described. Has been done.

The structure and operation of the above-mentioned Japanese Patent Laid-Open Publication No. 55-123715 will be described with reference to FIG. In FIG. 3, the processor unit PU301 executes the microprogram FW stored in the ROM 303, but in the initialization routine of the FW, all 1's are stored in the reset control register REG310 provided in the device control unit DCU306.
By writing 0 and then 0, other modules are hard cleared at the same time. Then, the adapter FDC 307 is instructed to read the FW of the portion not stored in the ROM 303 from the disk device FDD and load it to the RAM 304 to preset the registers in each adapter as required.
After the initialization is completed, the busy state of the adapter such as FDC307 is monitored. When the busy counter of the PU 301 is counted up from the busy state and overflows, by issuing an initialization signal for only that portion, damage to the device due to hang-up of each device can be minimized.

[0004]

However, in the above-mentioned conventional configuration, abnormal information is determined by reading busy information from each device at the time of hang-up, and as in the present invention, a normal readable / writable register is used. ,
It is not to judge whether the setting of the value is in normal operation and reset each device. Further, in the present invention, each device is not reset by hardware, but each register of the device in which an abnormality is detected is reset. Further, the above-mentioned conventional technology has a problem that the device cannot be initialized when the device is instantly brought into the reset state due to electrostatic noise or the like without leaving the busy state.

[0005]

In order to solve the above problems, a device operation automatic restoration device of the present invention comprises a register which can be read and written externally from the device, and a communication bus which allows the device to exchange data with the outside. By including a microcomputer for reading and writing the contents of the register inside the device via the communication bus, by constantly monitoring the contents of the register inside the device during operation to determine whether or not the value is in a normal operation Detects that the operating device is reset or the register value is garbled and the device is not operating normally due to electrostatic noise or external noise, and then resets the register to the normal value. It is possible to restore the normal operation of the device in which the abnormality has occurred. This allows the device to be initialized even in case of an accidental reset that cannot detect the busy state.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present invention, the operating state of each of N devices (N is an arbitrary integer) is constantly monitored, and each device is caused by electrostatic noise or external noise. Is configured to prevent each device from continuing abnormal operation by returning to normal operation for each device when the operation of is abnormal, and the microcomputer initializes each of the N devices and then The readable / writable register of each device is constantly monitored, and the setting value of each register is changed to an abnormal value due to electrostatic noise or external noise, or the setting value of the register is returned to the default due to an unexpected reset. Sometimes, by detecting an abnormal change in the set value and resetting the correct set value for each device, it is possible to prevent the abnormal operation of each device from continuing. A.

According to a second aspect of the present invention, the operating state of each device is constantly monitored, and when the operation of each device becomes abnormal due to electrostatic noise or external noise, the device operates normally. It is configured to prevent each device from abnormally operating and various outputs controlled by each device by returning, and the microcomputer can read and write each device after initializing each device. These registers are constantly monitored, and when the setting value of each register is changed to an abnormal value due to electrostatic noise or external noise or an unexpected reset is applied and the setting value of the register returns to the default value, this setting value By detecting an abnormal change and resetting the correct setting value for each device, each device operates with an inappropriate setting value and some outputs become abnormal. An effect that it is possible to prevent the operation of the entire system becomes abnormal.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) A block diagram of a device operation automatic restoration device in Embodiment 1 of the present invention is shown. In FIG. 1, reference numeral 101 is IC, 102 is IC, and 103 is I.
C, 104 are microcomputers, 105 are buses, 1
Reference numeral 06 is a register, 107 is a register, and 108 is a register.

The operation of the device operation automatic restoration device configured as described above will be described below.

In FIG. 1, IC101, IC102,
Each of the N ICs such as the IC 103 has a register 106 and a register 10 for internally defining its own operation from the outside.
7, register 108, etc., respectively, and each register 106, register 107, register 108, etc.
Reading and writing is performed by the microcomputer 104 via 05, but when the entire system starts operating, the microcomputer 104 sets initial values corresponding to the registers of each device to IC101, IC102, IC103.
Each register 106 and register 10 of each N number of ICs
7, write to register 108, etc.

Further, when the operation of the system is changed by an external command or input, the microcomputer 104 selects a register to be set and writes an appropriate value according to the change to control the system correctly.

By the way, impacts due to electrostatic noise or unexpected and strong noise from the outside are applied to the ICs 101, 102, I.
When it occurs in any of the N ICs such as C103, the register 106, the register 107, the register 108, etc. of the respective ICs change their setting values to an abnormal value or are suddenly reset due to the impact, and the setting values change. All may return to default.

If the IC that has fallen into the above-mentioned state continues to operate as it is, the output controlled by the IC becomes abnormal, and an abnormality appears in a part of the operation of the system or the whole operation.

In order to avoid an abnormality in a part of the operation of the system or the whole operation of the system, any one of the ICs has a shock due to electrostatic noise or accidental strong noise from the outside, and the IC has the same. It suffices to detect that the register setting value is an abnormal setting and restore the register value setting to normal.

Therefore, the microcomputer 106 is
If any readable / writable register of the N ICs, such as IC101, IC102, and IC103, is read at all times, the set value is compared with the normal value that should be set at present, and if If different,
The IC having the register is judged to be abnormally operating due to an external shock, and normal values are reset to all the registers of the IC.

(Second Embodiment) A block diagram of a device operation automatic restoration device according to a second embodiment of the present invention is shown. In FIG. 2, reference numeral 201 is a microcomputer, 202 is an audio processing IC, 203 is a video processing IC, 2
04 is a video / audio receiving IC, 205 is a bus, 206 is an antenna, 207 is a speaker, 208 is a CRT, 209
Indicates a register, 210 indicates a register, and 211 indicates a register.

The operation of the device operation automatic restoration device configured as described above will be described below.

In FIG. 2, the received signal that has entered the system through the antenna 206 enters the video / audio receiving IC 204, and is divided into intermediate frequency signals for audio / video according to the value of the register 211, and each is processed by the audio processing IC 20.
2. Enter the image processing IC 203. Voice signal is voice processing I
The signal is demodulated and amplified in the C202 according to the value of the register 209, and its output is transmitted to the speaker 207 so that the sound is correctly reproduced.

On the other hand, the video signal is synchronously separated, color demodulated, and video amplified in the video processing IC 203 according to the value of the register 210 and sent to the CRT 208, so that the video is correctly reproduced.

The microcomputer 201 sets the values of the register 209, the register 210, and the register 211 at any time according to the current reception state, and controls so that video and audio can be received and reproduced correctly.

When an impact due to electrostatic noise or unexpectedly strong noise from the outside occurs in any of the audio processing IC 202, the video processing IC 203, and the video / audio receiving IC 204, the register 209 and the register 210 of each of them are held. Due to the impact, the set value of the register 211 may change to an abnormal value or may be reset suddenly, and all the set values may return to default.

If the IC that has fallen into the above state continues to operate, the output controlled by the IC becomes abnormal. For example,
When the voice processing IC falls into the above state, an abnormality appears in voice reproduction. In order to avoid an abnormal operation of any of the above ICs, one of the ICs is impacted by electrostatic noise or unexpected strong noise from the outside, and the setting value of the register of the IC is set abnormally. Is detected,
The register value setting should be returned to normal.

Therefore, the microcomputer 201 always reads an arbitrary readable / writable register among the registers of the audio processing IC 202, the video processing IC 203, and the video / audio receiving IC 204, and the set value is normally set. If it is different, it is judged that the IC having that register is abnormally operating due to an external shock, and all registers of the IC are reset to normal values. .

[0024]

As described above, according to the device operation automatic restoration device of the present invention, the contents of the register inside the operating device are constantly monitored, and it is judged whether or not the value is in the normal operating condition. When the operating device is reset due to electrical noise or external noise, or when the value of the register inside the device becomes garbled and the device does not operate normally, reset the device to the normal setting value. The operation can be returned to normal operation.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a device operation automatic restoration device according to a first embodiment of the present invention.

FIG. 2 is a block configuration diagram of a device operation automatic restoration device according to a second embodiment of the present invention.

FIG. 3 is a block configuration diagram of a conventional device initialization method.

[Explanation of symbols]

 101 IC 102 IC 103 IC 104 Microcomputer 105 Bus 106 Register 107 Register 108 Register 201 Microcomputer 202 Audio Processing IC 203 Video Processing IC 204 Video / Audio Reception IC 205 Bus 206 Antenna 207 Speaker 208 CRT 209 Register 210 Register 211 Register 211 Register

Claims (2)

[Claims] 1. A method for constantly monitoring the register value of an operating device, resetting the register value to a normal value and restoring the device to normal operation when the device is reset or malfunctions. Characteristic device operation automatic return device. 2. A device is provided with a register which is built in the device and is readable and writable from the outside, a communication bus through which the device exchanges data with the outside, and a microcomputer which reads and writes the contents of the register via the communication bus. When the operating device is reset or detects that the device malfunctions, the microcomputer resets the value of the register to a normal value, and restores the operation of the device to a normal device. Automatic operation recovery device.